Orban Optimod-PC 1101, Operating Manual

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2-24
INSTALLATION ORBAN MODEL 1101
There are several properties you can set to match OPTIMOD-PC’s AES3 digital
outputs to your requirements.
A) Set the AES3 Digital Output sample rate.
[32], [44.1], [48 kHz], [88.2 kHz] or [96 kHz]
48 kHz or 96 kHz are preferred because their samples are synchronous
with the peak-controlled samples in the processing.
Selecting a 32 kHz output sample rate will automatically set the highest
available audio bandwidth to 15 kHz.
B) Set the Digital Output Sync mode to internal or external.
[Internal], [Digital 1 Input], or [Digital 2 Input]
OPTIMOD-PC’s AES3 output has a hardware sample rate converter that al-
lows the output sample rate to be synchronized to a source.
•
The I
NTERNAL
sync setting synchronizes the output words at the AES3 out-
put to OPTIMOD-PC’s internal clock.
•
The E
XTERNAL
setting synchronizes the output rate to the input rate. You
can use either the
D
IGITAL
1 I
NPUT
or the
D
IGITAL
2 I
NPUT
as the sync source.
The same input can also supply audio. If a given input is used only as a sync
source, it is wise to check the
M
UTE
box for that input in the Processor mixer
and Direct Mixer.
If a valid AES3 signal is present at the designated sync input, it will be
used for synchronization. If lock is unavailable, OPTIMOD-PC automati-
cally switches to
I
NTERNAL
. OPTIMOD-PC automatically returns to external
sync after one second of continuously valid AES3 signal lock at a valid
sample rate. Furthermore, external lock is only permitted when the out-
put rate matches the sync (or AES3 input) rate.
C) Set the desired output word length.
[14 bits], [16bits], [18bits], [20bits], and [24bits]
The largest valid word length in OPTIMOD-PC is 24 bits. OPTIMOD-PC can
also truncate its output word length to 20, 18, 16, or 14 bits. If the input
material is insufficiently dithered for these lower word lengths,
OPTIMOD-PC can add dither (see the next step), which is wise if the input
material is insufficiently dithered for these lower word lengths.
D) Adjust DITHER to on or off, as desired.
[in] or [out]
OPTIMOD-PC can add “high-pass” dither before any truncation of the
output word. The amount of dither automatically tracks the setting of
the
W
ORD
L
ENGTH
control.
OPTIMOD-PC’s dither is first-order noise shaped dither that adds less
noise in the midrange than white PDF dither. However, unlike extreme
noise shaping, it adds a maximum of 3dB of excess total noise power